[GRASS-user] An interesting problem

[Thomas Adams]

Hi all,

What I'm asking about is not specifically a GRASS issue. I'm helping a
Master's student use a hydrologic model, where I have written some GRASS
scripts to generate one of the required input files. It's called the
'connectivity' file because it identifies how the basin grids are connected
to each other (based on flow direction and flow accumulation). It works
pretty well.

The problem is this; the watershed in his study region includes a large
shopping mall that is outside the natural drainage, but through the
miracles of site development, stormwater now flows into the watershed of
interest. Of course, the entire mall area is impervious (parking lots and
rooftops).

I was thinking that the mall area could be recoded as a slightly sloping
surface into the natural watershed, with a contrived 'channel'. Any
thoughts on how we might do this. To be sure, a different model (SWMM)
would have been better (my original suggestion), but we're past that point.

Thank you,
Tom

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